Personally, since I primarily collect swords for their artistic merits, which are only visible in a polished blade, I would find little of interest in a blade that has not been polished. While indeed interesting from a historical perspective, without any additional background, provenance, etc., to me it is just an unpolished blade....just my opinion.
Of course, there may be a variety of reasons why it wasn't....could be it was found to have a hagire, as one possibility. No doubt there are many possibilities and we could conjecture and spin rationale for pages, but ultimately, it is something probably never known for certain.
I would have it polished, but again, that is just me....I'm curious to see what the other interesting item is.......